A car travelling with 20 m/s, comes to halt after travelling 18 m. Find the time taken by the car to stop.

The answer is 1.8 m/s.

Explanation:

Formula of speed is given below:

Speed, V = Distance / time

Given dа ta:

Distance, d = 18 m

Initial veliocity = 20 m/s

Final velocity = 0 m/s

Time taken, t = ?

Find average speed:

Average speed = (initial velocity + final velocity) / 2

= (20 + 0) / 2

= 20/2 = 10 m/s

Average speed = distance / time

Time = distance / Average speed

Time, t = 18m / 10ms-1 = 1.8 m/s

The time taken by the car is 1.8 m/s